Test I

PINPOINT TEST I: LOUD POPPING SOUND WHEN CYCLING THE KEY - CDX6 AND VEHICLE NAVIGATION RADIO (VNR) ONLY

Test I1:

Test I2-I4:

Test I4-I5:

Normal Operation
The START input circuit 50-MD15 (GY/OG) is sent to the audio unit when the key is turned to the START position. The audio unit then immediately mutes all speaker amplifier outputs and the subwoofer amplifier enable circuit output to eliminate the possibility of speaker pops during engine cranking.

Possible Causes
- audio unit
- circuit 7-MD19 (YE/RD) open, short to power, short to ground